Electrical phonograph apparatus



M. E. VANSICKLE ELECTRICAL PHONOGRAPH APPARATUS Oct. 29, 1929.

2 Sheets-Sheet 1 Filed March 17, 1927 MQZWZYZE V6672 1N VEN TOR.

'BY w ATTORNE IN V EN TOR.

ATTORNEY 2 Sheets-Sheet 2 M. E. VANSICKLE Filed March 17, 1927 law/4%MZvz'nE VizazszZ-Zie I BY ELECTRI CAL PHONOGRAPH APPARATUS Oct. 29,1929.

VIII/WW Patented 29, E929 UNITED STATES PATENT OFFICE MELVIN E.VANSICKLE, OF NEWARK, NEW JERSEY. ASSIGNOR TO BRANDES LABORA- TORIES,INC., OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY ELECTRICALPHONOGRAPH APPARATUS Application filed March 17, 1927. Serial No.176,088.

My invention relates broadly to electrical phonograph pick-up devicesand more particularly to a compact construction and assembly ofelectrical phonograph pick-up.

5 One of the objects of my invention is to provide a construction ofpick-up for electrical phonographs in which the parts of the pick-up maybe readily assembled without the exercise of any large degree of skillfor manu- 1 facturing a phonograph pick-up of a high degree ofsensitivity inexpensively on a quantity basis.

Another object of my invention is to provide a phonograph pick-upconstruction of the electrodynamic type wherein an armature member ispositioned within a powerful permanent magnet field and associated witha field winding in such manner that movements of a stylus in accordancewith a sound record may impart vibration to the armature member forchanging the condition of the electromagnetic winding for developingsuch differences in potential as will control the operation of anelectron tube amplification sys- 25 tem at large amplitude.

Still another object of my invention resides in the construction andarrangement of parts for an electrical phonograph pick-up as more fullydescribed in the specification hereinafter following by reference to theaccompanying drawings, in which:

Figure 1 is a side elevation of the phonograph pick-up device of myinvention; Fig. 2 is a longitudinal cross-sectional view taken throughthe phonograph pick-up device of my invention; Fig. 3 is across-sectional view taken through the phonograph pick-up on line 33 ofFig. 2; Fig. 4 is a lateral crosssectional view taken on line 44.of Fig.3; and Figs. 5 and 6 are views of the armature member and stylus holderwhich I provide for the electrical phonograph pick-up device.

Referring to the drawings in more detail, reference character 1indicates a phonograph having a revolving record table 2 carrying a discsound record 3. A swinging tone arm 4 is provided carrying theelectrical phonograph pick-up 5 which fits by means of holder 6 into theend-of the tone arm 4. The electhe securing bolt 23 passes.

trical phonograph pick-up is supported from the holder 6 by-the casingportion 7 which surrounds the parts of the phonograph pickup. The entireassembly of parts of the phonograph pick-up is mounted from a permanentmagnet 8 which is secured at its upper portion to the holder 6 by meansof plate member 9 and securing screws 10. The permanent magnet 8 has apair of parallel extending pole pieces 11 and 12 and between these polepieces, I provide pole members 14 and 15 in the form of yokes havingopposite pole faces aligned with respect to each other as represented by16 and 17 at one end and by 18 and 19 at the opposite end. The polemembers 14 and 15 have up-standing lugs 20 and 21 connected theretothrough which The securing bolt 23 serves as a spacing member for thepole members and may be adjusted in the screw threaded lugs 20 and 21and locked in position with respect thereto by sets of nuts 2st and aset of nuts 25. The pole members 14 and 15 are spaced from the polepieces 11 and 12 by means of spacer blocks 26 and 27 through which thesecuring screws 28 and 29 pass. A ring shaped member 30 is provided forpositively s acing the pole faces 18 and 19. the ring mem er 30 beingsecured to the pole faces byscrew means 31. The pole faces 18 and 19 aretapered toward each other for cooperating with laterally extendinggrooves 32 on opposite sides of the armature member 33. The armaturemember 33 is flat and extends through the electromagnetic winding 34which is mounted on the coil support 35. The upper end of the armature33 is forked at 36 extending around opposite sides of the screw device23. A flexible strip 37 apertured at 38 for the passage of the screwdevice 23 extends from the upper portion of the permanent magnet 8 at 39and is riveted to the armature 33 at 40. This strip 37 is flexible andpermits the free vibration of the armature 33 although the armature may,in this way, be held in a normally central position and excessivevibration dampened. The armature 33 carries a stylus holder 41 on theend thereof for receiving a stylus 42 which is secured in place by meansof a set screw 43. The entire'assembly of parts for the phonographpick-up is housed 'of my invention has been found to be extremelyeflicient in operation and practical in construction.

lVhile I have described my invention in one of its preferredembodiments, I desire it to be understood that modifications may be madeand that no limitations upon my invention are intended other than areimposed by the scope of the appended claims. I

What I claim as new and desire to secure by Letters Patent of the UnitedStates is as follows:

1. An electrical phonograph pick-up comprising a supporting member, apermanent magnet carried by said supporting member, said permanentmagnet having a pair of longitudinally extending parallel pole pieces, apair of U-shaped pole members positioned between said pole pieces,lugsintegrally connected to said U-shaped pole members, means projectingthrough said lugs for aligning said pole members with the pole facesthereof directed toward each other, an electromagnetic windingpositioned within said pole members, an armature member extendingthrough said electromagnetic winding and pivotally mounted between saidpole faces, means secured to the end of said armature member forlimiting the lateral movement said horse-shoe magnet, said pole membershaving sets of pole faces directed toward each other, lugs extendingfrom one end of said pole members and extending parallel to each other,a screw device projecting through said lugs for predetermining thespacial relation of said pole members, means at opposite ends of saidpole. members for positively spacing said pole faces, an electromagneticwinding positioned between said pole members and having a flat armaturemember extending through said electromagnetic winding and pivotallymounted with respect to said pole faces, a stylus carrier connected toone end of said armature member, and a resilient member extendingbetween the opposite end of said armature memberand said horse-shoemagnet for normally biasing said armature member in a central positionand limiting the movement of said armature member when mechanicalvibrations are impressed upon said stylus carrier.

An electrical phonograph pick-up comprising a supporting member arrangedfor insertion in the tone arm of a phonograph, a horseshoe magnetcarried by said supporting member, a pair of pole members havingopposite pole faces directed toward each other, a lug projecting fromthe end of each pole member, a screw device passing through each lug andadjustable therein for selectively fixing the spacial relation of saidpole faces, said pole members being positioned between the poles of saidhorse-shoe magnet, an elec tromagnetic winding positioned between saidpole' members, an armature member pivotally mounted between the polefaces at one end of said pole members and extending through saidelectromagnetic winding and across the pole faces at the opposite endsof said pole members, a leaf spring member connected be tween saidarmature member and a fixed pressing mechanical vibrations upon theopposite end of said armature member for varying the magnetic conditionof the electromagnetic winding.

4. An electrical phonograph pick-up comprising a supporting memberarranged for insertion in the tone arm of a phonograph, ahorse-shoe'magnet carried by said supporting member, a pair of polemembers having opposite pole faces directed toward each other, said polemembers being positioned between the poles of said horse-shoe magnet, anelectromagnetic winding positioned between said pole members, anarmature member pivotally mounted between the pole faces at one end ofsaid pole membersand extend-v ing through said electromagnetic windingand across the pole facesat the opposite ends of said pole members, lugsprotruding from said pole members, a screw device passing through saidlugs and locked with respect to said lugs for selectively spacing thepole faces of said pole members, said armature member extending onopposite sides of said screw device and being flexibly connected to aportion of said horse-shoe magnet, a stylus carrier connected to theopposite end of said armature member whereby vibrations impressed upon astylus inserted in said carrier may be transferred to said armaturemember for variably controlling the magnetic condition of saidelectromagnetic Winding.

5. An electrical phonograph pick-up device comprising a supportingmember arranged to be inserted into the tone arm of a phonograph, apermanent magnet carried by said supporting member, said permanentmagnet having parallel extending pole pieces, a pair of pole memberseach having aligned pole faces, said' pole members being secured at oneend to the extremitiesof the pole pieces of said permanent magnet, lugmembers positioned on the opposite ends of said pole members, a screwthreaded device for selectively spacing the pole faces of said polemembers with respect to each other, an electromagnetic windingpositioned within said pole members and having a hollow central core, afiat armature member pivotally mounted between opposed pole facesadjacent the extremities of the poles of said permanent magnet andextending through the hollow core of said electromagnetic winding andacross the pole faces at the opposite ends of said pole members, aspring member extending between said magnet and one end of said armaturefor centering said armature between said pole faces, and a styluscarrier connected with the opposite end of said flat armature memberwhereby mechanical vibrations may be imparted to said flat armaturemember from a stylus within said carrier for varying the magneticcondition of said electromagnetic winding.

In testimony whereof I afiix my signature.

MELVIN E. VANSICKLE.

